Seat and back cushion support for a chair



FIG. 1 is a rear elevational view of a seat and back cushion support fora chair which forms my new design, the broken lines of a chair being forillustrative purposes only and forming no part of my design;

FIG. 2 is a perspective view showing the top, left side and frontthereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a rear elevational view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The ornamental design for a seat and back cushion support for a chair,as shown and described.